In preparation for the June 14 public meeting on Exit 19 (6pm, Bridge Street School Cafeteria), the Massachusetts Department of Transportation has made available its presentation (PDF, 34MB) and Summer 2010 Fact Sheet (PDF) for download. This is a key meeting. All concerned citizens are urged to attend.
These slides from the presentation appear to show that Concepts 13A, 13B and 13C reduce delays to a similar extent as Concepts 15, 15A, 16, 17 and 18, but with a much lower impact on the surrounding neighborhood and a much lower cost.
Video: May 10 Meeting of the Exit 19 Project Advisory Committee